This family represents the periodic tryptophan protein 1 (PWP1), a chromatin-associated factor that regulates transcription during developmental growth as part of the TORC1 and Myc signaling pathway in response to nutrients. It regulates Pol I-mediated rRNA biogenesis and the epigenetic status of rDNA []. Drosophila melanogaster PWP1, also known as Protein no child left behind (nclb), is required in males for both germline stem cell (GSC) maintenance and early stages of germ cell differentiation of germ cell cysts []. In females it is necessary to regulate germ cell differentiation and egg chamber development [].
